The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 05, 2000
Filed:
Nov. 04, 1998
Eugen Thomas Buhlmann, Gossau, CH;
ITW Gema AG, Schweiz, CH;
Abstract
The invention concerns powder spray coating equipment comprising an air divider (16) to adjustably divide a total-air flow (6, 14) into a conveying-air flow (54, 57, 70) and a supplemental-air flow (56, 84, 86) in such manner that, when adjusting for a larger flow of conveying air, the flow of supplemental air shall be reduced in a predetermined ratio, and vice versa; further comprising an injector (76) to aspirate and to pneumatically convey coating powder by means of the flow of conveying air; and a supplemental-air intake (89) into the air/powder path (76, 82). The conveying-air path (54, 57, 70) and the supplemental-air path (56, 84, 86) each are fitted with at least one throttling duct each constituted by at least one channel (40, 42) in a rotatable shaft (34, 36) and by a bearing surface (39) covering the channel. The channels (40, 42) run in the circumferential shaft direction and their cross-section decreases monotonely from a channel beginning (41, 43) as far as a channel end (45, 47) whereby, together with the bearing surface (39) they form an increasingly larger flow impedance. The total-air path (6, 12, 14) communicates with the channel beginnings (41, 43). A conveying-air discharge aperture (54) is present in the bearing surface (39) above the channel (40) of the conveying-air path, and a supplemental-air discharge aperture (56) is present above the channel (42) of the supplemental-air path in the bearing surface (39), said discharge apertures running only over a very short segment of the the length of the channels.